Jumper, you're right to feel used. If I were you I'd make sure that next time you're asked something from your brother, be as 'in acceptance' and kind and generous as you have been, but also assertive too, if he's on the take again. And when you're in assertive mode, quote a scripture to him. He will hate it but he might also feel his conscience pricked. Instead of just being a prick.
Remember too, Jesus was treated like scum by the pharisees.
Trumangirl